Mortising-tool.



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' MORTISING TOOL.

APPLICATION FILED MAY 23, 1908.

' Patented Jan'. 26, 1909.

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FERDINAND O. LEHMANN, OF NORTH YAKIMA, WASHINGTON.

MORTISING-TOOL.

*Specification of` Letters Patent.

Patented Jan. 26, 1909.

Application filed May`23, 1908. Serial No. 434,601.

To all 'whom 'it may concern: Y

Be it known that I, FERDINANDO. LEH- MANN, a citizen of the UnitedStates, residing at North Yakima, in the county of Yakima and State ofWashington, have invented certain new and` useful Improvements inMortising-Tools, of which the following is a specication. j

- This invention relates to gages and has particular reference to amortising tool.

An object of the invention is to provide a tool that can be adjustedquickly relative to. its arts and to have apositive adjustment oftesame. i. f

Another object is to provide a device that will measure off the properdistances by the simple application of the instrument after it has beenadjusted. i

A further and important object is that the complete device can bevstamped from sheet' metal inone operation owing to they simplicityof itsstructure and the small number of parts.

Other objects and advantages will heapparent from the followingdescription and it will be understood that changes in the speciiicstructure shown and described may be made within the scope of the claimand that any suitable materials may beused without de arting from thespirit of the invention. l

nthe drawings forming a portion of this specification, and in which likenumerals of reference indicate similar parts in the several views,Figure 1 is a top plan viewl of the device, Fig. 2 is a side elevationof the same, Fig. 3 is an end elevation. Y

The device is produced with a lmetallic plate 10 which is formed withtwo laterally disposed slots 11 and 12 positioned at the opposite endsof said plate 10. The slots 11 and 12 are provided with series ofnotches 13 and 14 which extend in the sameV direction from the sides ofthe slots 11 and 12 and which are disposed one-'half an inch apart. Asecond plate 15 is provided-which carries upwardly projecting bolts 16and 17 which are threaded on their outer surfaces with right handthreads for the reception of milled :thumb nuts 18. The bolts 16 and 17are adapted to.

pass upwardly through the slots l1 and l2 Visc and engage in the notches13 and 14 respectively. The plate 10 carries upon its upper face a scale19 disposed at one of the longitudinal edges thereof. The thumb nuts 18comprise collars 2O which are internally threaded and which are enlargedto their upperends 21 having milled outer surfaces 22` about theenlargement 21.

In operation, kthe plates 10 and 15 are placed at right angles to eachother and the bolts 16 and 17 are inserted in the slots 11 and 12. Theplate 15 is moved laterally of theplate 1() until the requiredmeasurement is obtained. The measurement being calculated by the notches13 and 14 disposed at half inch intervals along the slots l1 and 12,when the plate 15 is longitudinally moved along the under side of theplate 10 causing the bolts 16 and 17 to be engaged in the correspondingnotches 13 and 14 and the plate amped in that position by operating thethumb nuts 18; The thumb nuts 18 are rotated and fed downwardly of thebolts 16 and 17 and are impinged against the upper face of the plate 10frictionally engaging the upper edge of the plate 15 against the underrside of the plate 10 at right angles thereto. The instrument when thusadjusted is applied over the ends of timber to be mortised determiningthe exact depth of the cuts which are to be made and which may bereadily marked along the edge of the plate 10.

VWhat is claimed is:

A tool of the character described compris` ing a plate having slots andnotches formed therein and a scale marked along one edge of said plate,a second plate disposed edgewise at right angles to said `first plate,bolts carried by said second late being adapted to engage slidably insaid slots and notches, and thumb nuts carried upon said bolts for thepurpose of securing said plates in adjustable relation.

In testimony whereof I aiiix my signature in presence of two witnesses.

S. R. MCCAW, GEO. E. STAcY.

